INT-01 SOLAS: Air-Sea interaction
Ice nucleation potential of particles collected during dust storm events in March 2021, China
Lisi Zhao* , College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China
Shengkai Wang, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China
Juying Lu, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China; State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102, China
Jiao Xue, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China
Yao Yao, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China
Kai Bi, Beijing Weather Modification Office, Beijing 100089, China
Bingbing Wang, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China; State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102, China

Dust particles are important sources of ice nucleating particle (INPs), but their ice nucleation ability at the single particle level is not well established. In order to investigate the influence factors, the law of size and component of INPs was analyzed. Aerosols samples were collected in Beijing during sandstorms in March 2021. Their ice nucleation ability and the physicochemical properties were investigated. Dust particles accounted for on average about 95% in number. The particles were classified into illite, kaolinite, chlorite, feldspar, quartz, and mixed-dust. For temperatures from 205 to 250 K, these particles nucleated ice via deposition or immersion mode with the relative humidity with respect to ice representing a wide range. Clay mineral particles were the main INPs. However, the size characteristics of INPs strongly depended on the type of clay mineral particles. The identified illite INPs are in large particle size range whereas kaolinite INPs are in sub-micrometer size. In addition, feldspar, quartz or mixed-dust also acted as atmospheric INPs.